Abstract

Effects of Co content on the magnetic properties and microstructure of melt-spun and ( and 0.3) nanocomposite ribbons have been investigated. The substitution of Co for Fe in ribbons enhances the coercivity from for for , due to the formation of ordered phase with higher anisotropy field. The effect of Co substitution for Fe in series ribbons is similar to that in system. Interestingly, larger magnetization could be obtained by decreasing the boron and Pt content simultaneously. Moreover, phase provides ribbons sufficient high coercivity, resulting in a remarkable enhancement of energy product from for Co-free ribbons to for ribbons with .